diff --git a/README.md b/README.md
new file mode 100644
index 0000000..25723a8
--- /dev/null
+++ b/README.md
@@ -0,0 +1,2 @@
+# A repo to keep some learning codes
+
diff --git a/Webhook/README.MD b/Webhook/README.MD
new file mode 100644
index 0000000..72019d7
--- /dev/null
+++ b/Webhook/README.MD
@@ -0,0 +1,3 @@
+## This repo is a simple implementation of Kubernetes Webhook
+
+The tutorial link is [here](https://slack.engineering/simple-kubernetes-webhook/)
\ No newline at end of file
diff --git a/Webhook/certificate/application/webhook.crt b/Webhook/certificate/application/webhook.crt
new file mode 100644
index 0000000..8c2c6d1
--- /dev/null
+++ b/Webhook/certificate/application/webhook.crt
@@ -0,0 +1,30 @@
+-----BEGIN CERTIFICATE-----
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+-----END CERTIFICATE-----
diff --git a/Webhook/certificate/application/webhook.csr b/Webhook/certificate/application/webhook.csr
new file mode 100644
index 0000000..9955337
--- /dev/null
+++ b/Webhook/certificate/application/webhook.csr
@@ -0,0 +1,22 @@
+-----BEGIN CERTIFICATE REQUEST-----
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diff --git a/Webhook/certificate/application/webhook.key b/Webhook/certificate/application/webhook.key
new file mode 100644
index 0000000..585ee61
--- /dev/null
+++ b/Webhook/certificate/application/webhook.key
@@ -0,0 +1,28 @@
+-----BEGIN PRIVATE KEY-----
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+-----END PRIVATE KEY-----
diff --git a/Webhook/certificate/ca/ca.crt b/Webhook/certificate/ca/ca.crt
new file mode 100644
index 0000000..eb90f06
--- /dev/null
+++ b/Webhook/certificate/ca/ca.crt
@@ -0,0 +1,31 @@
+-----BEGIN CERTIFICATE-----
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diff --git a/Webhook/certificate/ca/ca.key b/Webhook/certificate/ca/ca.key
new file mode 100644
index 0000000..0f7a233
--- /dev/null
+++ b/Webhook/certificate/ca/ca.key
@@ -0,0 +1,51 @@
+-----BEGIN RSA PRIVATE KEY-----
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+DN12L4VsCH2nyCqgAMHcFqAnSryiIq9JoJDwQKRpVfNizNEs8kBEkCyog9T3Wx7n
+BFRBR+h5gPh+yt/UV8ECOSWU5QUnTYCQEVwglK83SrFXb2UA4sLV6W2qdY5OFfkZ
+3ik1LUvF6MaPy3o3vSwySnJq5AOgDLuVz5i1fzaXhnLpMLdobe55WBX+hjlIhM1z
+ZNJAYI/9Xt9/yX1iIPT3oAmE/Q38Qx9LRbinKzyOeOqd9xkuJ2Cdyv/V0Ig=
+-----END RSA PRIVATE KEY-----
diff --git a/Webhook/certificate/ca/ca.srl b/Webhook/certificate/ca/ca.srl
new file mode 100644
index 0000000..8444052
--- /dev/null
+++ b/Webhook/certificate/ca/ca.srl
@@ -0,0 +1 @@
+23755E152D44BE15D991814DFCCE3EEFD869FDBA
diff --git a/Webhook/certificate/config.conf b/Webhook/certificate/config.conf
new file mode 100644
index 0000000..4ae206e
--- /dev/null
+++ b/Webhook/certificate/config.conf
@@ -0,0 +1,25 @@
+[req]
+distinguished_name = req_distinguished_name
+default_bits = 2048
+default_md = sha256
+req_extensions = v3_req
+prompt = no
+
+[req_distinguished_name]
+C = US
+ST = California
+L = San Jose
+O = jerxie
+OU = webhook
+CN = simple-kubernetes-webhook
+
+[v3_req]
+keyUsage = keyEncipherment, dataEncipherment
+extendedKeyUsage = serverAuth
+subjectAltName = @alt_names
+
+[alt_names]
+DNS.1 = simple-kubernetes-webhook
+DNS.2 = simple-kubernetes-webhook.learning
+DNS.3 = simple-kubernetes-webhook.learning.svc
+DNS.4 = simple-kubernetes-webhook.learning.svc.cluster.local
\ No newline at end of file
diff --git a/Webhook/certificate/create-ca.sh b/Webhook/certificate/create-ca.sh
new file mode 100644
index 0000000..d9a203c
--- /dev/null
+++ b/Webhook/certificate/create-ca.sh
@@ -0,0 +1,4 @@
+openssl genrsa -out ca/ca.key 4096
+
+
+openssl req -new -x509 -days 10000 -key ca/ca.key -out ca/ca.crt
diff --git a/Webhook/certificate/create-csr.sh b/Webhook/certificate/create-csr.sh
new file mode 100644
index 0000000..b0216d9
--- /dev/null
+++ b/Webhook/certificate/create-csr.sh
@@ -0,0 +1,4 @@
+rm -rf application/*
+
+#openssl genrsa -out application/webhook.key 4096
+openssl req -new -sha256 -nodes -out application/webhook.csr  -newkey rsa:2048 -keyout application/webhook.key -config config.conf
diff --git a/Webhook/certificate/domain.ext b/Webhook/certificate/domain.ext
new file mode 100644
index 0000000..f540632
--- /dev/null
+++ b/Webhook/certificate/domain.ext
@@ -0,0 +1,8 @@
+authorityKeyIdentifier=keyid,issuer
+basicConstraints=CA:FALSE
+subjectAltName = @alt_names
+[alt_names]
+DNS.1 = simple-kubernetes-webhook
+DNS.2 = simple-kubernetes-webhook.learning
+DNS.3 = simple-kubernetes-webhook.learning.svc
+DNS.4 = simple-kubernetes-webhook.learning.svc.cluster.local
\ No newline at end of file
diff --git a/Webhook/certificate/sign-cert.sh b/Webhook/certificate/sign-cert.sh
new file mode 100644
index 0000000..01cac10
--- /dev/null
+++ b/Webhook/certificate/sign-cert.sh
@@ -0,0 +1,6 @@
+# CA signed
+openssl x509 -req -CA ca/ca.crt -CAkey ca/ca.key -in application/webhook.csr -out application/webhook.crt -days 365 -CAcreateserial -extfile domain.ext
+
+
+# self-signed.
+# openssl x509 -signkey application/webhook.key -in application/webhook.csr -req -days 365 -out  application/webhook.crt
diff --git a/Webhook/certificate/verify-application-cert.sh b/Webhook/certificate/verify-application-cert.sh
new file mode 100644
index 0000000..c4f4102
--- /dev/null
+++ b/Webhook/certificate/verify-application-cert.sh
@@ -0,0 +1 @@
+openssl x509 -text -noout -in application/webhook.crt
\ No newline at end of file
diff --git a/Webhook/deployment/deployment.yaml b/Webhook/deployment/deployment.yaml
new file mode 100644
index 0000000..134b44f
--- /dev/null
+++ b/Webhook/deployment/deployment.yaml
@@ -0,0 +1,24 @@
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: simple-kubernetes-webhook
+  namespace: learning
+spec:
+  selector:
+    matchLabels:
+      app: simple-kubernetes-webhook
+  template:
+    metadata:
+      labels:
+        app: simple-kubernetes-webhook
+    spec:
+      containers:
+        - image: simple-kubernetes-webhook:latest
+          name: simple-kubernetes-webhook
+          volumeMounts:
+            - name: tls
+              mountPath: "/etc/admission-webhook/tls"
+      volumes:
+        - name: tls
+          secret:
+            secretName: simple-kubernetes-webhook-tls
\ No newline at end of file
diff --git a/Webhook/deployment/secret.yaml b/Webhook/deployment/secret.yaml
new file mode 100644
index 0000000..b3dc402
--- /dev/null
+++ b/Webhook/deployment/secret.yaml
@@ -0,0 +1,8 @@
+apiVersion: v1
+kind: Secret
+metadata:
+  name: simple-kubernetes-webhook-tls
+type: kubernetes.io/tls
+data:
+  tls.crt: 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
+  tls.key: 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
\ No newline at end of file
diff --git a/Webhook/deployment/service.yaml b/Webhook/deployment/service.yaml
new file mode 100644
index 0000000..da586fa
--- /dev/null
+++ b/Webhook/deployment/service.yaml
@@ -0,0 +1,12 @@
+apiVersion: v1
+kind: Service
+metadata:
+  name: simple-kubernetes-webhook
+  namespace: default
+spec:
+  ports:
+    - port: 443
+      protocol: TCP
+      targetPort: 443
+  selector:
+    app: simple-kubernetes-webhook
\ No newline at end of file
diff --git a/Webhook/deployment/webhook.yaml b/Webhook/deployment/webhook.yaml
new file mode 100644
index 0000000..9f1a0e8
--- /dev/null
+++ b/Webhook/deployment/webhook.yaml
@@ -0,0 +1,22 @@
+apiVersion: admissionregistration.k8s.io/v1
+kind: ValidatingWebhookConfiguration
+metadata:
+ name: "simple-kubernetes-webhook.acme.com"
+webhooks:
+ - name: "simple-kubernetes-webhook.acme.com"
+   namespaceSelector:
+     matchLabels:
+       admission-webhook: enabled
+   rules:
+     - apiGroups: [""]
+       apiVersions: ["v1"]
+       operations: ["CREATE"]
+       resources: ["pods"]
+       scope: "*"
+   clientConfig:
+     service:
+       namespace: learning
+       name: simple-kubernetes-webhook
+       path: /validate-pods
+       port: 443
+     caBundle: 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
\ No newline at end of file
diff --git a/Webhook/webhook-server/go.mod b/Webhook/webhook-server/go.mod
new file mode 100644
index 0000000..2fc305c
--- /dev/null
+++ b/Webhook/webhook-server/go.mod
@@ -0,0 +1,25 @@
+module example.com/m/v2
+
+go 1.17
+
+require (
+	k8s.io/api v0.24.0
+	k8s.io/klog/v2 v2.60.1
+)
+
+require (
+	github.com/go-logr/logr v1.2.0 // indirect
+	github.com/gogo/protobuf v1.3.2 // indirect
+	github.com/google/gofuzz v1.1.0 // indirect
+	github.com/json-iterator/go v1.1.12 // indirect
+	github.com/modern-go/concurrent v0.0.0-20180306012644-bacd9c7ef1dd // indirect
+	github.com/modern-go/reflect2 v1.0.2 // indirect
+	golang.org/x/net v0.0.0-20220127200216-cd36cc0744dd // indirect
+	golang.org/x/text v0.3.7 // indirect
+	gopkg.in/inf.v0 v0.9.1 // indirect
+	gopkg.in/yaml.v2 v2.4.0 // indirect
+	k8s.io/apimachinery v0.24.0 // indirect
+	k8s.io/utils v0.0.0-20220210201930-3a6ce19ff2f9 // indirect
+	sigs.k8s.io/json v0.0.0-20211208200746-9f7c6b3444d2 // indirect
+	sigs.k8s.io/structured-merge-diff/v4 v4.2.1 // indirect
+)
diff --git a/Webhook/webhook-server/go.sum b/Webhook/webhook-server/go.sum
new file mode 100644
index 0000000..90e1e8c
--- /dev/null
+++ b/Webhook/webhook-server/go.sum
@@ -0,0 +1,241 @@
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diff --git a/Webhook/webhook-server/main.go b/Webhook/webhook-server/main.go
new file mode 100644
index 0000000..b5e8496
--- /dev/null
+++ b/Webhook/webhook-server/main.go
@@ -0,0 +1,36 @@
+package main
+
+import (
+	"flag"
+	"fmt"
+	"net/http"
+	"os"
+
+	"k8s.io/klog/v2"
+)
+
+func main() {
+	flag.Parse()
+	// // handle our core application
+	// http.HandleFunc("/validate-pods", ServeValidatePods)
+	// http.HandleFunc("/mutate-pods", ServeMutatePods)
+	http.HandleFunc("/health", ServeHealth)
+
+	// start the server
+	// listens to clear text http on port 8080 unless TLS env var is set to "true"
+	if os.Getenv("TLS") == "true" {
+		cert := "/etc/admission-webhook/tls/tls.crt"
+		key := "/etc/admission-webhook/tls/tls.key"
+		klog.Info("Listening on port 443...")
+		klog.Info(http.ListenAndServeTLS(":443", cert, key, nil))
+	} else {
+		klog.Info("Listening on port 8080...")
+		klog.Info(http.ListenAndServe(":8080", nil))
+	}
+}
+
+// ServeHealth returns 200 when things are good
+func ServeHealth(w http.ResponseWriter, r *http.Request) {
+	klog.Infof("uri %s healthy", r.RequestURI)
+	fmt.Fprint(w, "OK")
+}